How to rename multiple sheets? Macro?

How can I sum across multiple sheets in Calc? I’ve got multiple sheets (about 60) in my workbook and I’ve given all of them unique names. Creating the formula by typing in each name would take too long.

I look for a Calc Extension to do this but didn’t see any. Any ideas?

Thanks.

So do you want to rename the sheets, or do you want to sum across them, as in =SUM(Sheet1.A1:Sheet3.B2)?